Stopper



FIG. 1 is a top perspective view of a stopper showing my new design;

FIG. 2 is a front elevation view of the stopper of FIG. 1, the rear being a mirror image thereof;

FIG. 3 is a right side elevation view of the stopper of FIG. 1, the left side being a mirror image thereof;

FIG. 4 is a top view of the stopper of FIG. 1;

FIG. 5 is a bottom view of the stopper of FIG. 1; and,

FIG. 6 is a bottom perspective view of the stopper of FIG. 1.

The broken lines illustrating a human finger in FIG. 1 depict environment and form no part of the claimed design. All other broken lines depict portions of the stopper that form no part of the claimed design. 

CLAIM The ornamental design for a stopper, as shown and described. 